On Wed, Aug 28, 2024 at 2:44 PM Roger Quadros <rogerq@xxxxxxxxxx> wrote:
>
>
>
> On 28/08/2024 17:33, Robert Nelson wrote:
> > On Fri, Aug 23, 2024 at 10:33 AM Robert Nelson <robertcnelson@xxxxxxxxx> wrote:
> >>
> >>>> +
> >>>> +&cpsw3g {
> >>>> + pinctrl-names = "default";
> >>>> + pinctrl-0 = <&rgmii1_pins_default>, <&gbe_pmx_obsclk>;
> >>>
> >>> Why do you need OBSCLK for Ethernet MAC?
> >>> The OBSCLK is connected to the Ethernet PHY via C406 which is not even populated.
> >>> It seems that the PHY is clocked by a crystal oscillator X5 so doesn't really
> >>> need OBSCLK in the stock configuration?
> >>
> >> Ah crap, I'll take a look at this... I bet it's left over from the
> >> first pcb, (all my first rev pcb's are now locked up so i don't use
> >> them anymore).. Seeed/BeagleBoard was playing it safe and designing
> >> in both options.. Once the internal clocks were verified newer
> >> revisions removed the external clock.
> >>
> >> Yeah, I'm pretty sure final production boards removed every external
> >> clock option.
> >
> > Yeap, external clock is the default for all production boards, i
> > removed this internal clock configuration.
>
> Did you mean internal clock is the default?
> Earlier you mentioned
> "after verification newer versions removed the external clock"
Yeah sorry Roger, screwed up on my previous message... I thought one
of our goals was to have an internal clock for everything. But @Aldea,
Andrei reminded me Monday night, that Ethernet was external..
Regards,
--
Robert Nelson
https://rcn-ee.com/
